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Thursday, 16 September 2010 12:25

AMD Barts specs leaked

Written by


256-bit bus, 960 shaders
Chinese tech site Chiphell has leaked an interesting slide featuring full AMD Barts specs and the numbers look impressive.

The new Barts series should succeed Juniper-based HD 5770 and HD 5750 boards, but it will deliver a significant performance boost. The biggest difference is the transition to a 256-bit memory bus, which will provide quite a bit more bandwidth than the 128-bit Juniper series. Both boards should feature 1GB of memory, but we’re still not sure about memory clocks, as we’re getting some mixed information.

Barts XT will feature 12 SIMDs, 960 shaders, 48 texture units and 32 ROPs. For comparison, Juniper XT packs 800 shaders and 40 texture units, so Barts will have 20 percent more of everything. The core should end up clocked at 850MHz and the TDP is rated at over 150W, which is quite a bit more than the HD 5770.

Barts PRO packs 800 shaders, 40 texture units and 32 ROPs, much like the current Juniper XT, but it will also have a wider 256-bus. It will be clocked between 700MHz and 725MHz and its TDP should end up below 150W.

AMD is pitting both boards against Nvidia’s GTX 460: Barts PRO will take on the 768MB version of Nvidia’s GTX 460, while Barts XT should fight the 1GB version. Judging by the spec, Barts boards should be able to outperform the GTX 460 and we wouldn't be surprised if they match HD 5830 or even 5850 performance in some scenarios, thanks to higher clocks and the 256-bit bus.

More here.
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Comments  

 
+19 #1 Chip Architect 2010-09-16 12:34
AMD's David Hoff said that slide is "interesting" : http://www.donanimhaber.com/ekran-karti/haberleri/amdnin-grafik-bolumu-stratejik-yaklasimlar-direktoru-ilginc.htm
 
 
-12 #2 BernardP 2010-09-16 13:34
Nice link, Chip Architect. This slide seems to be from AMD.

AMD seems to be ready to plug the hole in its 5xxx series that the GTX460 is aimed at.

The only thing keeping me from switching from NVidia to AMD is the fact that AMD video drivers won't let me create and scale any custom resolution, something NVidia has been offering for years.
 
 
-9 #3 NickThePrick 2010-09-16 13:42
I guess ATI shows a 512bit bus on the high end models. If rumors are true and they are mostly improved 5870s, that would enable them to release a great performing card with a 512bit bus at a reasonable price.
 
 
+19 #4 Bl0bb3r 2010-09-16 13:48
"so Barts will have 20 percent more of everything"

Not just that, from what I've heard, each Shader Processor built is a bit different. Instead of 4 dumb-units + 1 very-smart-unit that make up an SP, they'll have 4 above-average-smart units, This should change the game on complex operation that include special functions.

Quoting NickThePrick:
I guess ATI shows a 512bit bus on the high end models [...] that would enable them to release a great performing card with a 512bit bus at a reasonable price.


You're joking, right?
Not that 512bit bus wouldn't be the best, but it would add to the cards circuit complexity that it would actually be getting more expensive, not cheaper. Would you still buy an NI that's above GTX480's price?
 
 
+25 #5 distinctively 2010-09-16 14:15
This chart has been discussed at the semiaccurate forums for a while now and isn't being taken too seriously. I'm not saying that its fake for sure, just very questionable.
 
 
+15 #6 The_Wolf88 2010-09-16 14:32
With Specs like that they will wipe 460 for sure !!
 
 
+9 #7 Alexko 2010-09-16 14:38
Quoting distinctively:
This chart has been discussed at the semiaccurate forums for a while now and isn't being taken too seriously. I'm not saying that its fake for sure, just very questionable.



Yep, same on Beyond 3D.
 
 
+42 #8 leftiszi 2010-09-16 14:52
Since English is not my native language, whenever I hear this "Barts" two things pop up to mind.

Farts and Bart Simpson!
 
 
+5 #9 nele 2010-09-16 15:15
Quoting Alexko:
Quoting distinctively:
This chart has been discussed at the semiaccurate forums for a while now and isn't being taken too seriously. I'm not saying that its fake for sure, just very questionable.



Yep, same on Beyond 3D.



Well it's still a bit too early to know for sure, but the specs sound reasonable enough.

Basically Barts should end up with an improved, optimized architecture and more shaders, but the really big difference is the bus. AMD obviously figured out that it could squeeze out more performance by adding a wider bus rather than cramming more transistors into a 40nm core.

I think it's unlikely we'll see a 256-bus on the next generation, as it will be 28nm and engineers will have more breathing room to work on the core, so they'll probably stick to the much cheaper 128-bit bus...
 
 
+7 #10 canerpense 2010-09-16 16:45
This "leaked" document looks like poorly photoshopped to look new, but I think the original was an ancient ATI-AMD pre-production paper.

Can someone explain how Z-stencil value stays same for both cards while the GPU core and shader speed increases?

And also if they were 128Gsamples/s, that would be even more than 5870's Z-stencil value.

Also AMD PR says "interesting" and "I never heard something such as Cypress Dual Engine in my life" in the interview at donanimhaber. (Note: I'm Turkish)

Maybe some AMD fanboi knows more than AMD PR about these cards. 8)

Seems imposibble.
 

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